Cases



D. WILLIAMSON.

Cartridge Case.

Patnted June 29, 1869.

UNITED STATES PATENT OFFICE.

DAVID WILLIAMSON, on NEW YORK, N. Y.

IMPROVEMENT IN THE MANUFACTURE OI METALLIC CARTRIDGE CASES.

Specification forming part of Letters Patent N 0. 92,136, dated June 29, 1869.

To all whom it may concern:

Be it known that 1, DAVID WILLIAMSON, ot' the city and State of New York, have invented and made an Improvement in the Manufacture of Metallic Cartridge-Cases; and I do hereby declare the following to be a full, clear, and

exact description of the said invention, referaction of the dies in finishing the case. In

practice it is found that the teat being thus made of hardened metal and round, there is not power enough in most hammers of tirearms to explode the fulminate contained in said teat, and the metal cannot be annealed alter the last operation of the dies, or else the cylindrical portion of the case would be too soft for the subsequent handling, or to withstand the concussion in firing.

To obviate the aforesaid difficulty in exploding the t'ulu'iinate, the teat has been flattened, but this itwolres the necessity of placing-the cartridge in the chamber with the flattened portion in one direction. This is difficult to do, particularly in the dark or when in a hurry.

The nature of my said invention consists in the manner of making the said cartridge so that the teat for the fulminate is very soft and easily indented by the hammer to produce the explosion, and, at the same time, the case itselfis rendered as hard and solid as usual in cases of this character.

To effect these objects I employ dies that are formed so as to produce the hollow teat in the sheet metal complete, previous to the annealing of the sheet metal thelast time, after which the dies are employed only to stretch, reduce, and harden the sides of the sheet-metal case, leaving the teat in the soft condition in hich it remains after annealing.

in the drawing,Fignrel shows thecartridgecase in one of the first stages in which it is made by the dies, the teat a being partially pressed up. Fig. 2 represents the cartridge case in a second or subsequent stage, with the teat fortued completely. At this stage of the manufacture, the shell is thoroughly annealed, and the subsequent operation or operations do not compress or act on the metal of the teat, hence it is left sutficiently soft to becompressed freely by a blow on the side with the hammer of an ordinary tire-arm. In Fig. 3 the cartridge-case is shown complete by the cylindrical portion being drawn down to the proper size by dies, which, at the same time, harden and stiffen the metal forming the cylindrical portion of the case.

The trinuning 011' of the mouth or end of the metallic cartridge-case is performed in any usual manner.

What I claim, and desireto secure by Letters Patent, is i A shectmetal cartridge-case,formed with a teat, the metal of which issol't, and with cylindrical sides, the metal of which is hardened by the action of thedies, as and for the purposes set forth.

In witness whereofI have hereuntoset my signature this 17th day of March, 1869.

DAVID WILLIAMSON. 

